1 /* 2 * Copyright (c) 1997-2000 by Sun Microsystems, Inc. 3 * All rights reserved. 4 */ 5 6 #if defined(LIBC_SCCS) && !defined(lint) 7 static const char sccsid[] = "@(#)mktemp.c 8.1 (Berkeley) 6/4/93"; 8 static const char rcsid[] = "$Id: mktemp.c,v 8.4 1999/10/13 16:39:21 vixie Exp $"; 9 #endif /* LIBC_SCCS and not lint */ 10 11 /* 12 * Copyright (c) 1987, 1993 13 * The Regents of the University of California. All rights reserved. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 1. Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in the 22 * documentation and/or other materials provided with the distribution. 23 * 3. All advertising materials mentioning features or use of this software 24 * must display the following acknowledgement: 25 * This product includes software developed by the University of 26 * California, Berkeley and its contributors. 27 * 4. Neither the name of the University nor the names of its contributors 28 * may be used to endorse or promote products derived from this software 29 * without specific prior written permission. 30 * 31 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 34 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 41 * SUCH DAMAGE. 42 */ 43 44 /* 45 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 46 * 47 * Permission to use, copy, modify, and distribute this software for any 48 * purpose with or without fee is hereby granted, provided that the above 49 * copyright notice and this permission notice appear in all copies, and that 50 * the name of Digital Equipment Corporation not be used in advertising or 51 * publicity pertaining to distribution of the document or software without 52 * specific, written prior permission. 53 * 54 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 55 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 56 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 57 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 58 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 59 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 60 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 61 * SOFTWARE. 62 */ 63 64 65 #pragma ident "%Z%%M% %I% %E% SMI" 66 67 #include "port_before.h" 68 69 #include <sys/types.h> 70 #include <sys/stat.h> 71 72 #include <ctype.h> 73 #include <errno.h> 74 #include <fcntl.h> 75 #include <stdio.h> 76 77 #include "port_after.h" 78 79 #if (!defined(NEED_MKTEMP)) && (!defined(NEED_MKSTEMP)) 80 int __mktemp_unneeded__; 81 #else 82 83 static int gettemp(char *path, int *doopen); 84 85 #ifdef NEED_MKSTEMP 86 mkstemp(char *path) { 87 int fd; 88 89 return (gettemp(path, &fd) ? fd : -1); 90 } 91 #endif 92 93 #ifdef NEED_MKTEMP 94 char * 95 mktemp(char *path) { 96 return(gettemp(path, (int *)NULL) ? path : (char *)NULL); 97 } 98 #endif 99 100 static int 101 gettemp(char *path, int *doopen) { 102 char *start, *trv; 103 struct stat sbuf; 104 u_int pid; 105 106 pid = getpid(); 107 for (trv = path; *trv; ++trv); /* extra X's get set to 0's */ 108 while (*--trv == 'X') { 109 *trv = (pid % 10) + '0'; 110 pid /= 10; 111 } 112 113 /* 114 * check the target directory; if you have six X's and it 115 * doesn't exist this runs for a *very* long time. 116 */ 117 for (start = trv + 1;; --trv) { 118 if (trv <= path) 119 break; 120 if (*trv == '/') { 121 *trv = '\0'; 122 if (stat(path, &sbuf)) 123 return(0); 124 if (!S_ISDIR(sbuf.st_mode)) { 125 errno = ENOTDIR; 126 return(0); 127 } 128 *trv = '/'; 129 break; 130 } 131 } 132 133 for (;;) { 134 if (doopen) { 135 if ((*doopen = 136 open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0) 137 return(1); 138 if (errno != EEXIST) 139 return(0); 140 } 141 else if (stat(path, &sbuf)) 142 return(errno == ENOENT ? 1 : 0); 143 144 /* tricky little algorithm for backward compatibility */ 145 for (trv = start;;) { 146 if (!*trv) 147 return(0); 148 if (*trv == 'z') 149 *trv++ = 'a'; 150 else { 151 if (isdigit(*trv)) 152 *trv = 'a'; 153 else 154 ++*trv; 155 break; 156 } 157 } 158 } 159 /*NOTREACHED*/ 160 } 161 162 #endif /*NEED_MKTEMP*/ 163